SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d020a1d974cc0f7c389f75d947dd741e987807b238fc4f78b47a5d6dd01b1a3' 
  AND token = '+Txhv4aKLSsXdge+fDXbZGLhJJ0qWfa1MBPzdpucB+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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