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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f197362a532c99fb16d8976b24c497bf0dcdf3b817826033c7db4f3df08459ea' 
  AND token = 'ewqkuT5NEBZ2W7X/9rUbdLk7fpDsG9va5yHSk5FOcvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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