SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '860ebfa7943ece2f1ee857b4bf290a022c79b0534be5fe8d3e5e84eb163c1d44' 
  AND token = 'OQesYyZhwimOXdIFqMWyjhnqiGXjClO0Lzc01UU+PPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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