SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dcbfb732976ae01dc60e833e8c4ef5f4d0969ffc418931c31cdb30e2149e032' 
  AND token = 'EjNtzvGxo+OTYuLWuGaG0o9/v5hJRJEYwGiCpMc6/C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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