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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01d2a7a4bd38ae3a6b6a2598d45ef56be0315bfa3364731cc48bb335e13f1fba' 
  AND token = 'LaF4hjzH/wAqNx1YzM71k+CbLzdc4fmoP2hbk4vJY8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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