SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e44f7db6c627d2a8d0cbc24609f023852f5902e8a751c37f23ed728265e3d1bc' 
  AND token = 'VywHOuGFbBWAQ8TiUpUUveRqHMyRc+VAKJQcdS53nOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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