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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fb319772d1215ba8e5fb9194721638feae5d77eaca66f7a312a5256b69cb4e5' 
  AND token = '8gi6OGNcwA74GaFUJRX1GeP3n2xmD0NVFfw5rqpjFQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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