SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eb938078db5f9a5c6b804e07e1664d0f5cf928ece619c837de41c2aec5e2c8f' 
  AND token = 'FgpYay63Kthq53+H/E0dWx4BSY+46qOjy3fVIkKQ0QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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