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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5e658d33e163e7d20750e75dfd9f66ab8e576c011d4806e722e350799fd029d' 
  AND token = 'ZtRF0VysjVgCjUv5cYVXPcrvURIeelAtbVzAw6gs2nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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