SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdd12826180d9cfad9fbe7e7546f1d213e18d5977118ecd73657f55477e327d4' 
  AND token = 'QCs/Bq83WuM/nH4xOlTG/2fDCDThtKngia2i7PqL5jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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