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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2e080cff3629e6d4cc079d9c6171b75f9b48dc10705ce64b9864d93c2b9ef55' 
  AND token = 'l7c+J8mxbjSwPrEQe6TVGU7z0QePgALNWceHL4lpefs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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