SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b611d70d1a4787052043b570d93f67a20a29bd3b22a1ac5e23dd51b69dfba67' 
  AND token = 'Msq5HIglzqrZ04WYJUQSSZVYcjolQ7nyxLw+OXhyZnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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