Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaa2c184643adb79f3a21519354d1189f6a6c353122d4cdcccb0a4acbfbf439f' 
  AND token = 'KmgW6ayk5bStnbdi4XwM7Vzmf7qe/arI32jVuaBtoG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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