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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60938c8043f09613d95df1279360d1587b6927797136502512c34e243216c92b' 
  AND token = 'MqZyRsTD5VT+GB8a4JwTk9NT/o9rpE0aLjyWGcEcGbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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