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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf0a39de9cf50c6688798939d88cbb257c1c356340c2b010dd5ba2394f284bd9' 
  AND token = 'k3R16o47C94G6YJpqGj8W+33tCISdcr+AKdGTSRn3WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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