SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1778cf357880115e001ba87e6b058a96883ba3bc2b59701c09e5756f5c44a30a' 
  AND token = 'N1MI40KDmau++PzCBsxVK/YikQwIyMMyzlSRZUeZmdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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