SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5739b4b425a3fb84f87a93228ac6f11db1a219457e93aa0c3daf5fc16cbae78' 
  AND token = 'jJJlVCS0woLexsf6Ie0H1+j+6+xpmBdFA7BFx0gOXk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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