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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a826b7dd73c5c3a9b903fd75ad91e4e002cc34ffd14454e8c151b28dff704802' 
  AND token = '34bakcORV/tYGs5XfrEBFxn3TnmhWOrsV9Mg/yPLPcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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