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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f64479e540a23982e643190702e12adcd72b2dc506db47028e4d24dc7f6964f' 
  AND token = 'xZkwNwWqL0watt/LXg3urvoQmMwk/OOSxPI76Y/GMWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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