SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e27a9120fe51522851798891eea3c5cf63c415bbf14aab16fc482bbe963a1740' 
  AND token = 'johiaQsQuB2E/Kxb3rdK0+Q02u9DXNcZFzga6jlYzGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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