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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9744944a4768ec5772110c541c317e3f61edb428a8d92f837c73c51a5530515' 
  AND token = 'LImK7txjaHjBlGSuLkaVcX+CLr8amYlt057QyN6w8wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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