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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3007d214c4c8a45a2506a2596876318ab8a4cbecf2674374db74941f95a961e9' 
  AND token = 'D50pbr36n4+E5emLYN7m4e9V6SPW7ucM/Wel2O9FU0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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