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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38db439dc6c46e08ab43e9ee23cb4d8645ec48c2fb15938b398f5f4b897ef14c' 
  AND token = 'WzxAlXZv3nyp3Zb1rVvtDPYL9ThlaZrIrRVhySj2YUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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