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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0395681de5020db23b141525ce15069bf2502b7413a87c11e75bfd3efb0efb05' 
  AND token = '0Sc747k4OKFer1jxtDRpviVKYIiGX/885J3OBFfxM6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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