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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '066e25a8909e6e2896b77c9ccd7899c28581f91cda63b3d25f594a277ca8a037' 
  AND token = '3NgUI5nenRohTEoAB50Xyun2oWSVL0IXgV5OPUn8SEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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