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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76b2492f07bcc3cc7d354a486c95e20f23eff629fcbd605990d543bdca897695' 
  AND token = 'RdEjLRkH/M0SuMQVzD01w3nYkURS4qnHyTBTF29loAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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