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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a24667521fca5cab65f2ce335f5a4e3fe344453e6a2e463bfdd6474ccd7474ec' 
  AND token = 'UjyqrcI/NG8s2ytSGS1peOoi15zBP+sYkIwVj70fTXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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