SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2c64f238e75d8ef15e40f6b9d4d94178fd6ec57416f3dfc6225b3a4c5a8c020' 
  AND token = 'YX/h8e5nkALgPIGDnv5JxQNUcL38Di7mfz/FJ+ilr1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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