SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8fccc44454d17e92859107ea81988e64d7d416aed48f66dfd43ba05f6b85e7e' 
  AND token = 'OGP92ME9JuZQSUwOBkPXh0auNIuG8LFFW/AQ4eGYyHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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