SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2349860fc372184005e8ed87b0ec99d1b2818275828c9346d0754f64f44c58b' 
  AND token = 'Zkhwi2q0AWmZlnBfKGzfaFvU6tgcOOrd5CQ/nX9vKOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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