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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9046a6720224011b534fad2681deed337a8befd6c09b0066c79a405f9f7c885' 
  AND token = 'vfX9I20j017gEhyWlioYNXYgPbmqOGMew1FMeOPuGfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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