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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87a12eedf56068dba79eec2f10d7162f6dead9e92578fd0095667f9d73eaa5bf' 
  AND token = 'KxA3bCc2iSwfAcwKY5N6a7E9FfqxaVpXosXbwZpla2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}