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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90d1fcc83fc6a337d4ecf3bc1aa17b5d41197e7b24150221eb6620f6d7f66e54' 
  AND token = '0DCVPoXiJUUanHNoNFQVRlqu7ca0TtEeEOUQwV87xrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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