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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1c2f5639246524493d7c4fd8ac0639b2ad597f60bf010f4cf8a15b64bed5199' 
  AND token = 'qpU/eGxahltKKD/aln8/lru/Fk17Ctyt06QBukycLTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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