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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5b18ae0ae525623293a26ea77120bea232ebdee17c1d910d8261eb1132e2cd5' 
  AND token = 'dxhLqGINv/ghRI8j1GLbwT8k0CFCzsVXL/ALTpJl29Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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