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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e2629a94b202e988f53a8e57581ae2d35a41d93534b157826f9105a59d73c72' 
  AND token = 'qiA2SOq1lcavOLtdv8E5D6Pznr5DvR40s0g95BDx6qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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