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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '532f463b7f3228b12987f890e0142865cd437d3fe69ba01d4ff0eb7d769df3f3' 
  AND token = 'imfI0oBfUS7WwwSd9kKFBFAOAtQ1qwHIZkqHS9plIHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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