SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '237db6bdb0e5987b32ac7729916ae572ffb41bf3e25f26a4e87b7355f397cba0' 
  AND token = 'NXxeXBylvgprn8DwjzHp1Fk9T1yIfuTWpL4bvVBhGmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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