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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb00c0bf8c3ae7fbaec1e598cb31a73790bbcf79bae56fcf5a3df9e14caa4a08' 
  AND token = 'VNDYsBTlh6KZhsaUE52R0qZBYAU5Usf+cPQtp1pAJvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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