SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '110fd4f96e0e4df6b3dca2475e728b3e4919a545b9bba15da0dc4f210138e3f6' 
  AND token = 'O/uvq5LiJO1E+MlqoY+Mtbbrgv3g59uz8fCh+SABH1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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