SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '292194324d786f064eca41c3c609732505f7a6e8bbf90afc2d953cdb8596d380' 
  AND token = 'Z3fRZrSRAfCEBEjh+W7tQAQIqAjKEVY/j19S9j23aEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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