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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6d4bbf70afa79d18dbd287f143cc350b9a261df2be08cec7b8177127439bf9b' 
  AND token = 'f4jdKn1OPPkq+eWCyUNPZCOTd/qMMm4OCz/hNEEQyzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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