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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db2c4cd551c4ddaeef3e84befd3c3076511a671d672a36096e074909d86010da' 
  AND token = 'S7ajWGePfPcDo1XV1QsMfpDikLG3ntVAo8gxN7hmM2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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