SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43bdc1ba2b5abb60bf1ef504469675bad80913161a0816f874a819d39c2395cb' 
  AND token = 'eSxj2PURSkVOh6wPs1PzMUJeJDF/dECh+XEA7AFEd+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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