SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7384ce371c487397a62a162cbb60e1108e3785a99f30d6abaf1465ef8b8f88a6' 
  AND token = 'RLPwvC/hIKYu2Q9p9SUZ0IUT8YgAVMra6mzgbBmGJKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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