SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93851f30f8a4dbe19891eb74d52143b952daaa11b6f298e088d7ffdd5dbc45c3' 
  AND token = '5Pq1aJu1qVtB05RZUeV+DJVT+bv7Yw9gcss46Xi1fo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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