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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd618605e3b94e01a7012b9a9490d189a25890ec72474ceb2d229d91f0e9f498e' 
  AND token = '0CfRE7+47N/+75zPvjr7OuWfPm5ooSvwVp1BjTdLcsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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