SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '932fe9931d1135f1c58ab294fbad7ab310495b4bf9ad3b4c4d96105ad21d112b' 
  AND token = 'KeINpQJTpixhHHV1Gufyhpw+nmkzBpDdU/ioEFgqRx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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