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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cba5ef0101441f9ddf0baa2aa1a44b0fd1c1ad0505f7519fa1435ea023a0cdd' 
  AND token = 'ka8ai+BI53OWGI9Ko6ozlwJKGz/9sNjclu35tff/1XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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