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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '097850925e6475bba2afb796e46d3a1edd36c4b0c19fc45b631479a44940fc81' 
  AND token = 'qvScJ859ADPJ4boNKj9MUjupxLfGSlH1xAF3cudAiuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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