SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f52b355233ce3ee8f7a0ba51c91594a778e336794e51563c3d581fc7acf52974' 
  AND token = 'Ck/1tZ8jjDf874zTtjuAv0Xsxmmu/oGYZQxfg+Hh/AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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