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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b11055cbe5cd79ab66c2d9d7349624640166f13196cdfd08d190d8f2fadef10' 
  AND token = '/wZa2ShYFEzvUb6wqUVZMur0LTTc49N1rv0f6QjT4VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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