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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24e39a37e280d3603ba84b1ebba9ec1fe6f362c4a217d269ad097fa9ef1b6818' 
  AND token = 'qBSIKh9t+oWIh2bpihtBVjHpub97GMDlaFlghSUM4v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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