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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd495c4f0fdc6474693abff88480830256a14b9c08ca2411718a169e32708e107' 
  AND token = 'JOdcNCq2K2al+yWJc3+J6Z0U1NfGEWEvXpWMom+qKlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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