SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caec2d3cfc30983da8a7a0707642d9ecb8e4f60948e4619a3df2ac5e1c476087' 
  AND token = 'J5Zw/QpGExp4OG2v+tAXnPqqNxEXTKhQEtTe22BQ0zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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