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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6b8fc09448dab429ca07988fdc2d99b42ef52b33d060dbb0ad9ede11ba9b4fa' 
  AND token = 'hauCugaXmFVEv0nNo5RYNQtqUK7aYVadK8MC3x1v4AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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