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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db37f007bd6d1075f7ec860ac45a28daf4580050135953ab8bc9d7e8c904e6f8' 
  AND token = 'CaALJz0yokq0SIQ67sZzk89FRsLHsNcAa/RoqsJmZSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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