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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '384f918d15a5b871ea75a3288e30baf277fc1b92fc838603b86c2998c5c354ef' 
  AND token = 'gg4hEUaXkeCfYdiAWw0R3dnAxiWbPV9LsLIYWGl6VPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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