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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '526064de3266edb367e2acbd5da8228f1824c326ce3a01a42b2be16d579b5cf6' 
  AND token = 'Cwbf8b/FrrpyM7LU+TMu2lS9HtJDKK5b7DYrpW94qpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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