SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04789f7b12c007a65664831d98e62b795447f1753a254ff70d065f6b43b0f005' 
  AND token = 'fp2GUmGUnI9u+mi9mrXuZQhefZ5/Yv/fhkBQ87I4Saw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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