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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bde1e8a789bb248f9078672b7ea8067e2b9e9f5c9e474d8fbbab813862ebf6cf' 
  AND token = 'G0TK+tfBDd/7T2NvMElX8QbDZhxcrNJP+7jkgAnv1no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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