SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cac39f1d0d2398581bc2008394f10485c3d593c2a642692b6f565a7401d52eb' 
  AND token = 'OrJKC3YWUfjaZDwYDgKKhOn607IFoLUS46lYR2nG8Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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